Liquid crystal display device
AssigneeHitachi, Ltd.
InventorsMasayuki Ohta, Masahiro Ishi, Kikuo Ono, Nobuyuki Suzuki
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Abstract
A liquid crystal display device can realize a broad visual field angle comparable to a cathode ray tube and produce a high brightness and a high image quality, with low power consumption and a narrow frame. To achieve these features, in an active matrix system liquid crystal display device, a counter electrode and a pixel electrode are linearly formed so as not to flatly overlap each other, thus enabling generation of an electric field parallel to the substrate surface, and an insulating film having a specific dielectric constant not greater than 4 is formed on a drain line, thus forming the counter electrode on the insulating film to cover the drain line.
Claims18
An active matrix system liquid crystal display device comprising a pair of substrates and a liquid crystal composition layer which is sandwiched between said pair of substrates, wherein a plurality of drain lines and a plurality of scanning electrodes, a plurality of thin film transistors connected to said drain lines and said scanning electrodes and a plurality of pixel electrodes connected with a plurality of said thin film transistor elements are provided on one of a pair of substrates, the improvement being characterized in that a said counter electrode is formed on one of said pair of substrates,
- an insulating film having a specific dielectric constant of not greater than 5 is formed on said drain line, and
- said counter electrode is formed on said insulating film such that said counter electrode covers at least a portion of said drain line.
An active matrix system liquid crystal display device comprising a pair of substrates and a liquid crystal composition layer which is sandwiched between said pair of substrates, wherein a plurality of drain lines and a plurality of scanning electrodes, a plurality of thin film transistors connected to said drain lines and said scanning electrodes and a plurality of pixel electrodes connected with a plurality of said thin film transistor elements are provided on one of said pair of said substrates, the improvement being characterized in that
- said pixel electrodes and a counter electrode are formed such that an electric field is generated approximately parallel to the surfaces of said pair of substrates,
- an insulating film having a specific dielectric constant of not greater than 5 is formed on said drain line, and
- said counter electrode is formed on said insulating film such that said counter electrode covers at least a portion of said drain line.
An active matrix system liquid crystal display device comprising a pair of substrates and a liquid crystal composition layer which is sandwiched between said pair of substrates, wherein a plurality of drain lines and a plurality of scanning electrodes, a plurality of thin film transistors connected to said drain lines and said scanning electrodes and a plurality of pixel electrodes connected with a plurality of said thin film transistor elements are provided on one of said pair of substrates, the improvement being characterized in that said a counter electrode is formed on one of a pair of substrates,
- an organic insulating film is formed on said drain lines, and
- said counter electrode is formed on said insulating film such that said counter electrode covers at least a portion of said drain line.
An active matrix system liquid crystal display device comprising a pair of substrates and a liquid crystal composition layer which is sandwiched between said pair of substrates, wherein a plurality of drain lines and a plurality of scanning electrodes, a plurality of thin film transistors connected to said drain lines and said scanning electrodes and a plurality of pixel electrodes connected with a plurality of said thin film transistor elements are provided on one of said pair of substrates, the improvement being characterized in that
- said pixel electrodes and a counter electrode are formed such that an electric field is generated approximately parallel to the surfaces of said pair of substrates,
- an organic insulating film is formed on said drain lines, and
- said counter electrode is formed on said insulating film such that said counter electrode covers at least a portion of said drain line.
Dependencies are inferred from the claim text.